Bandura and Walters 1963 showed videos to children where an adult is acting aggressively towards the BOBO doll.
Group 1 children: saw man being praised for the aggressive behaviour. ie: 'well done'
Group 2 children: saw man being punished by being told off
Group 3( control): saw no consequence for their aggression
When children were given their own BOBO dolls group 1 showed most aggression followed by group 3 then group 2